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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10797) Disk usage summary of snapshots causes renamed blocks to get counted twice
Date Thu, 29 Sep 2016 18:27:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15533611#comment-15533611
] 

Jing Zhao commented on HDFS-10797:
----------------------------------

Actually my proposal is like your .005 patch. The current semantic and approach looks good
to me overall.

> Disk usage summary of snapshots causes renamed blocks to get counted twice
> --------------------------------------------------------------------------
>
>                 Key: HDFS-10797
>                 URL: https://issues.apache.org/jira/browse/HDFS-10797
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>         Attachments: HDFS-10797.001.patch, HDFS-10797.002.patch, HDFS-10797.003.patch,
HDFS-10797.004.patch, HDFS-10797.005.patch
>
>
> DirectoryWithSnapshotFeature.computeContentSummary4Snapshot calculates how much disk
usage is used by a snapshot by tallying up the files in the snapshot that have since been
deleted (that way it won't overlap with regular files whose disk usage is computed separately).
However that is determined from a diff that shows moved (to Trash or otherwise) or renamed
files as a deletion and a creation operation that may overlap with the list of blocks. Only
the deletion operation is taken into consideration, and this causes those blocks to get represented
twice in the disk usage tallying.



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